June 28 2008
In 2000, two miners at a silver and zinc mine near Chihuahua, Mexico, stumbled upon an extraordinary natural phenomenon 1200 feet below the surface. They found giant selenite (gypsum) crystals, some up to 36 feet in length and 55 tons in weight, filling two underground caves. Now dubbed the Cueva de los Cristales, these amazing caves are home to the largest natural crystals on Earth.
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